Lateral-torsional buckling behavior of members in steel structures with hanging-profile connections

2013 ◽  
pp. 501-502
Keyword(s):  
Steel Structures ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Buckling Behavior

scholarly journals A comparative study of beam design curves against lateral torsional buckling using AISC, EC and SP

2019 ◽  
Vol 15 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Vera V Galishnikova ◽  
Tesfaldet H Gebre
Keyword(s):  
Steel Structures ◽  
Reduction Factor ◽  
Steel Beams ◽  
Steel Beam ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Vertical Loading ◽  
Beam Design ◽  
Overall Stability

Introduction. Structural stability is an essential part of design process for steel structures and checking the overall stability is very important for the determination of the optimum steel beams section. Lateral torsional buckling (LTB) normally associated with beams subject to vertical loading, buckling out of the plane of the applied loads and it is a primary consideration in the design of steel structures, consequently it may reduce the load currying capacity. Methods. There are several national codes to verify the steel beam against LTB. All specifications have different approach for the treatment of LTB and this paper is concentrated on three different methods: America Institute of Steel Construction (AISC), Eurocode (EC) and Russian Code (SP). The attention is focused to the methods of developing LTB curves and their characteristics. Results. AISC specification identifies three regimes of buckling depending on the unbraced length of the member ( Lb ). However, EC and SP utilize a reduction factor (χ LT ) to treat lateral torsional buckling problem. In general, flexural capacities according to AISC are higher than those of EC and SP for non-compact sections.

scholarly journals Calibration of Design Buckling Curves for Lateral-Torsional Buckling of Cantilever Beams Made of Glass—Experimental and Numerical Investigations

2019 ◽  
Vol 9 (16) ◽  
pp. 3432
Author(s):  
Ralph Timmers ◽  
Tobias Neulichedl
Keyword(s):  
Cantilever Beam ◽  
Cantilever Beams ◽  
Testing Device ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Numerical Investigations ◽  
Buckling Behavior ◽  
Load Carrying ◽  
Special Case ◽  
Important System

Using glass as a primary load-carrying element is becoming more and more popular in architecture. Probably the most used application is the single-span girder, but another important system is the cantilever beam, which is widely used, e.g., as a canopy in front of an entrance. Research on the lateral-torsional buckling behavior of glass beams has been typically performed on single-span girders. As a consequence, the design buckling curves provided in literature are usually too conservative for the widely used case of a cantilever beam, which is also related to the loading situation. Therefore, experimental and numerical investigations have been performed for this special case. Based on the obtained results, design buckling curves have been developed and resulted in being more economical than the curves already given in the literature. Among others, information on the shape and size of the real imperfections, a testing device for cantilever beams, and experimentally and numerically obtained load-deflection curves are additional outcomes of the investigations presented here.

The Lateral Torsional Buckling Behavior of Laminated Glass Beams

2020 ◽  
Vol 20 (07) ◽  
pp. 2050080
Author(s):  
Xiaokun Huang ◽  
Mingzhe Cui ◽  
Qiang Liu ◽  
Jianguo Nie
Keyword(s):  
Initial Imperfection ◽  
Influential Factors ◽  
Scale Model ◽  
Laminated Glass ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Load Duration ◽  
Long Span ◽  
Buckling Behavior ◽  
Glass Type

In this paper, the lateral torsional buckling (LTB) behavior of multi-layered long-span laminated glass (LG) beams is investigated through full-scale model test and numerical simulation. In the test program, the LG beams consisting of up to four glass plies and spanning 5000[Formula: see text]mm are constructed and tested. The load-displacement curves and development of strain in glass plies are recorded, based on which the deformation and stress state of buckled LG beams are analyzed, and the strength checking criterion is provided. The test results are also used to determine the shape and amplitude of initial imperfection through statistical analysis and to validate a numerical model based on the finite element method (FEM). Parametric analysis based on the FEM model is then conducted to investigate influential factors on the LTB resistance of LG beams, among which the influence of shape and amplitude of initial imperfection is emphasized. For the LTB design of LG beams, the applicability of existing formula to determine the critical buckling moment through effective stiffnesses is evaluated for multi-layered LG beams with the test and numerical results. Finally, the design buckling curves adopting the Ayrton–Perry formula (APF) are proposed and validated for LG beams categorized with glass type and load duration.

Evaluation of CSA S16-14 asymmetry parameter for singly-symmetric beams

2019 ◽  
Vol 46 (3) ◽  
pp. 230-235
Author(s):  
James C. Koch ◽  
Robert G. Driver ◽  
Yong Li ◽  
Michael Manarin
Keyword(s):  
Exact Solutions ◽  
Asymmetry Parameter ◽  
Steel Structures ◽  
Approximate Equation ◽  
Lateral Torsional Buckling ◽  
Current Standard ◽  
Torsional Buckling ◽  
Cross Sectional ◽  
Design Standard ◽  
Sectional Shape

The provisions in the Canadian design standard S16, Design of Steel Structures, for determining the lateral–torsional buckling capacity of unequal-flange I-shaped beams employ an asymmetry parameter, βx, that is a function of the cross-sectional shape. It has been observed that the approximate equation for this parameter in the standard can be highly inaccurate in some cases. A study was completed to compare the approximate values of βx to the exact solutions for 16 312 singly-symmetric I-sections and 188 standard WT-shapes from the CISC Handbook of Steel Construction. It is concluded that the current standard provides extremely variable results, but is generally conservative for use in design, with the exception of T-sections, as long as the larger flange is in compression. Recommendations for adoption into the next edition of the standard are provided.

scholarly journals Inelastic Ultimate Load Analysis of Steel Frames Considering Lateral Torsional Buckling Under Distributed Loads

2019 ◽  
Author(s):  
Mutlu Secer ◽  
Ertugrul Turker Uzun
Keyword(s):  
Carrying Capacity ◽  
Ultimate Load ◽  
Steel Frames ◽  
Load Carrying Capacity ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Numerical Examples ◽  
Buckling Behavior ◽  
Load Carrying ◽  
Load Analysis

Contemporary structural design approaches necessitates ways to determine realistic behavior of structures. For this purpose, inelastic ultimate load analysis methods are used widely since strength and stability of whole structure can be represented. In this study, a numerical method is proposed for determining inelastic ultimate load capacity of steel frames considering lateral torsional buckling behavior under distributed loads. In the analyses, inelastic material behavior, second-order effects and residual stresses of the structural frame system and its members are taken into account. Additionally, lateral torsional buckling behavior is considered in the analysis using finite difference method and it is used for determining the structural load carrying capacity of steel frames. Consequently, the problem associated with flexural capacity decreases due to lateral torsional buckling is precisely considered in the load increment steps of inelastic ultimate load analysis. In order to validate the proposed method, numerical examples from the literature are calculated considering the proposed method, AISC 360-16 design specification equations and approaches from the literature. Results of the numerical examples show that lateral torsional buckling is a key issue in determining structural load carrying capacity. Thus, proposed analysis method is shown to be an efficient and consistent tool for inelastic ultimate load analysis.

scholarly journals EFFECT OF VERTICAL WEB STIFFENERS ON LATERAL TORSIONAL BUCKLING BEHAVIOR OF CANTILEVER STEEL I-BEAMS

2004 ◽  
Vol 7 ◽  
pp. 233-246
Author(s):  
Mohammed HASSANIEN ◽  
Machaly BAHAA ◽  
Hesham SOBHY ◽  
Ahmed HASSAN ◽  
Junya INOUE
Keyword(s):  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Buckling Behavior ◽  
Web Stiffeners
Sign in / Sign up

Export Citation Format

Share Document